On September 1, 1990, Fox Company purchased a machine for \(\$ 675,000\). The machine was expected to last six years and have a salvage value of \(\$ 45,000\). Calculate depreciation expense for 1991, assuming

(a) straight-line depreciation,

(b) sum-of-the-years'-digits depreciation, and

(c) declining-balance depreciation at twice the straight-line rate.